finding the closest values in a set of data

basically i have 2 sets of data:

A = [4; 7; 13; 44; 55;];

B = 1; 3; 8; 9; 33; 45; 48; 53; 54; 66];

I want to compare every value in A to every value in B, and then have MATLAB figure out where the closest values of all those in A occur in B. So 4 is closest to 3, 7 is closest to 8, 13 is closest to 9, etc.

I want my output to be an index list in terms of B.. so basically i need:

index = [2; 3; 4; 6; 9]

Is this possible?

Answer 1

[Sean de Wolski]

[junk,index] = min(bsxfun(@(x,y)abs(x-y),A,B'),[],2);

Of course it's possible!

Answer 2

[Fangjun Jiang]

A = [4; 7; 13; 44; 55;];

B = [1; 3; 8; 9; 33; 45; 48; 53; 54; 66];
C=bsxfun(@minus,A,B');
[D,Index]=min(abs(C),[],2)